面向低温冷疗应用的混合工质制冷系统工质筛选与性能研究OA

In recent years,whole-body cryotherapy(WBC)has garnered increasing interest within the health and medical sectors.Concurrently,there has been a notable technological shift in cryotherapy equipment,transitioning from liquid nitrogen-fed systems to all-electric configurations.Based on the Joule-Thomson refrigeration cycle,this study presents the system design,construction,and performance optimization of mechanical WBC chambers tailored for both single-person and multi-person applications.For the single-person chamber(with an internal volume of approximately 1.3 m3),six groups of mixed refrigerants with varying compositions and molar fractions were evaluated.The system achieved cooling capacities of 500,1000,1500,and 2000 W at air outlet temperatures of 137.25,141.95,145.25,and 148.65 K,respectively.The air outlet temperature within the chamber dropped to a minimum of 140 K in approximately 110 minutes.For multi-person cryotherapy chambers,three mixtures of working fluids with different compositions and molar components were screened.The chambers exhibited cooling capacities of 500,1000,1500,and 2000 W at outlet temperatures of 131.55,132.15,134.25,and 142.45 K,respectively.The air outlet temperature decreased to 136 K after approximately 95 minutes.Experimental results validate the robust low-temperature performance of the developed mechanical cryotherapy chambers,demonstrating their significant potential as viable alternatives to traditional liquid nitrogen-based systems.